Thanks guys! Yeah, I'm sure that would work, however I have the wattbox power meter for mine which uses a magnet placed on the non-drive side of the 'wheel'. It uses the known mass of the flywheel and takes into account pressure and temperature to estimate force to spin the fan. Not as exact as a strain-gauge power meter but it'll work for me.
https://www.bikerumor.com/2014/01/27...-now-shipping/
If the skewer slips during starts, I'll just throw a track nut on the drive side since the spindle threads are the same as rear hub axle threads.
You're stuck switching gears if you want to change resistance which is unfortunate for warmup to workout-effort transitions. The fan isn't adjustable and if it were, the power meter would be really inaccurate.